| | Re: Live fish food - Grindal worms
You might be able to tell them apart by the way they move. Grindals are Annelid worms (segmented) and move mainly by extending and contracting their body, like earthworms. Microworms are Nematodes (non-segmented) and move by sinuous bending, like eels. Note: Annelids can also move by sinuous bending when they're in a hurry to get away from something. But nematodes can never extend and contract, as far as I know.